My uncle is claiming my house in Kolkata which my father gifted me how to defend my title

You can file a suit for declaration of title and permanent injunction before the civil court in Kolkata seeking a declaration that you are the lawful owner of the property. You must produce the gift deed, registration documents, and mutation entries as evidence of your title. Under West Bengal Premises Tenancy Act 1997, a registered gift deed is irrevocable and cannot be challenged by other family members. You can also seek an interim injunction restraining your uncle from interfering with your possession. If the lower court's decision is unfavorable, you can appeal to the Calcutta High Court under West Bengal Premises Tenancy Act 1997 for appropriate relief.